How is it that Georgian Orthodox Church are in full communion with the Eastern Orthodox Church when they have a different biblical canon? There is a table on this wikipedia page which indicates that the Georgian Orthodox Church accepts 2 Esdras 3–14 (4 Ezra) and 4 Maccabees as part of their biblical canon, whereas the rest of the Eastern Orthodox Church do not.

In that case how is it possible that the Georgian Orthodox Church is considered in full communion with the Eastern Orthodox Church? Isn't there a standard "canon of scripture" dogma which all Eastern Orthodox Churches are bound to accept?

Possible explanations: 


The Georgian Orthodox Church is not actually in full communion with the Eastern Orthodox Church, the wikipedia page is inaccurate.
Those books are considered canon in the "permitted to be read during the liturgy" sense, but not in the "Inspired by God"/"God speaks through these books" sense. (Even so this wouldn't really solve the discrepancy noted in my question)
The Eastern Orthodox canon of scripture is not a dogma, but merely a disciplinary canon which is still technically open for debate. The fact that the majority of the Eastern Orthodox Churches have the same canon is just a happy coincidence, but not a requirement of the faith. (It seems like this is the case in the Oriental Orthodox Church, where each of the member churches seems to have a wildly different canon. cf The Ethiopian Tewahedo Orthodox Church's canon)
The 85th Apostolic Canon, ratified at the Quinisext Council in Trullo in 692, enumerated the list of Old Testament books:


  Let the following books be counted venerable and sacred by all of you,
  both clergy and Laity.  Of the Old Testament, five books of Moses,
  Genesis, Exodus, Leviticus, Numbers, Deuteronomy; of Joshua the Son of
  Nun, one; of the Judges, one; of Ruth, one; of the Kings, four; of the
  Chronicles of the book of the days, two; of Ezra, two; of Esther, one;
  [some texts read “of Judith, one”;] of the Maccabees, three; of Job,
  one; of the Psalter, one; of Solomon, three, viz.:  Proverbs,
  Ecclesiastes, and the Song of Songs; of the Prophets, twelve; of
  Isaiah, one; of Jeremiah, one; of Ezekiel, one; of Daniel, one.  But
  besides these you are recommended to teach your young persons the
  Wisdom of the very learned Sirach.


This Canon was adopted for the entire Church at the Seventh Ecumenical Council in Nicea in 787.

There is nothing in the Canon that prevents additional books from being included in the same binding, anymore that the Canon prohibits commentary or apparatus such as might appear in a study Bible.  

An earlier local council, the Council of Carthage in 397, enumerated a similar list of books with the instruction that those listed were the only ones appointed to be read in the Church.  The Church of Georgia follows the same Church Lectionary as the rest of the Eastern Orthodox Church, which does not include any of the books you indicate.