Are there theological explanations for why God allowed ambiguity to exist in Scripture? Doctrinal differences abound in Christianity. This is attested to by the numerous times the Church has suffered splits and given birth to different denominations, branches, and sub-branches. The question Can somebody summarize the different “branches” of Christianity to me, and explain why they exist in the first place? gets this point across tremendously well.
But this inevitably leads us to ask the question: Why did God allow something like this to happen in the first place? If we look at the root causes of the many divisions in the history of the Church, one main reason that immediately stands out is the many different ways in which the Scriptures have been interpreted throughout history. And this is nothing to be surprised about when you have Scriptures that are inherently ambiguous, lending themselves to different, and sometimes mutually exclusive, interpretations.
And just to make matters even more complicated, even before we get to interpret anything, the question about what is considered part of the canon of Scripture and what isn't is also controversial in and of itself (for evidence of this, simply take a look at the many questions that have already been asked on the topic of the canon of scripture).
If God was behind the scenes inspiring and guiding the compilation of the Bible, then it follows that the existence of ambiguity in Scripture (what should be included in the canon, how Scripture should be interpreted, etc.) couldn't have been a coincidence. It had to be intentional. God, for some unknown reason, deliberately and intentionally allowed ambiguity to exist in Scripture.
Why?

(*) Note: I don't intend this question to be opinion-based, so I would rather encourage answers that draw on reputable sources, e.g., the works of reputable Christian philosophers or theologians that have discussed this question before, etc. Alternatively, if a denomination has an official denominational answer to the question, it would be great to know about that too.

Related: Are there any denominations that give official advice on how to handle the uncertainty in their doctrines?
In Matthew 13, Jesus reveals that it is God's will that some people understand and others be confused:

11 He replied, “Because the knowledge of the secrets of the kingdom of
heaven has been given to you, but not to them. 12 Whoever has will be
given more, and they will have an abundance. Whoever does not have,
even what they have will be taken from them. 13 This is why I speak to
them in parables:
“Though seeing, they do not see;
though hearing, they do not hear or understand.
14 In them is fulfilled the prophecy of Isaiah:
“‘You will be ever hearing but never understanding;
you will be ever seeing but never perceiving. 15 For this people’s heart has become calloused;
they hardly hear with their ears,
and they have closed their eyes. Otherwise they might see with their eyes,
hear with their ears,
understand with their hearts and turn, and I would heal them.’
16 But blessed are your eyes because they see, and your ears because
they hear. 17 For truly I tell you, many prophets and righteous people
longed to see what you see but did not see it, and to hear what you
hear but did not hear it.

Jesus is here repeating sentiments found in Psalms 115 &amp; 135 and in Isaiah 6.
Furthermore, Proverbs 2 tells us that wisdom only comes to people who make a long study of Scripture.

My son, if you accept my words
and store up my commands within you, 2 turning your ear to wisdom
and applying your heart to understanding— 3 indeed, if you call out for insight
and cry aloud for understanding, 4 and if you look for it as for silver
and search for it as for hidden treasure, 5 then you will understand the fear of the Lord
and find the knowledge of God. 6 For the Lord gives wisdom;
from his mouth come knowledge and understanding. 7 He holds success in store for the upright,
he is a shield to those whose walk is blameless, 8 for he guards the course of the just
and protects the way of his faithful ones.
9 Then you will understand what is right and just
and fair—every good path. 10 For wisdom will enter your heart,
and knowledge will be pleasant to your soul. 11 Discretion will protect you,
and understanding will guard you.

You have to prove you believe, that God's word matters to you and is precious before such wisdom is entrusted to you. Also, as Jesus said, the Kingdom of Heaven is one that grows like a mustard seed (Matthew 13 &amp; 17). It does not start out full size. You begin with small understanding and if you cultivate it patiently, you end up with great understanding.
Thus the Church is filled with people at every level of understanding, and some charlatans with no understanding.
In the last three years, through an increased thirst for the reading of scripture, I have learned more than in the previous two decades combined. What that tells me is that even after thirty years of being a Christian, I have much to learn. If it is true for individuals like me, it is also true for denominations and other groupings of Christians. In my study of Ecclesiastes 3, I have found two interesting things. First, the 28 times (a time to be born , a time to die, etc) describe the phases we go through as we grow from infancy to adulthood, with the final time being peace. Second, these times also describe the history of Israel and the Church as God's people corporately grow from infancy to maturity. We are still not all the way there, but we will get there.