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?
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)