When holding a map in each hand, only one's background and player icon are updated.
Linked issues
is duplicated by 15
MC-84380
Map in off-hand doesn't update
Resolved
MC-84527
Map in Offhand Doesn't Update While Traveling
Resolved
MC-84665
Making a new map locks the cursor on previously made maps.
Resolved
MC-84773
Maps don't update in off-hand
Resolved
MC-85087
One of two map don't update in hands
Resolved
10 more links
Confirmed.