I've found one unfortunate interaction between Carry On and Malisis Doors. If you try for any reason to open certain Malisis Doors custom doors while sneaking¹ (this affects at least all of the 3x3 double doors), you will find yourself suddenly carrying the door.

If you're using Malisis Doors and Carry On together, you should probably blacklist at least the following tile entities:

malisisdoors:big_door_acacia_3x3
malisisdoors:big_door_birch_3x3
malisisdoors:big_door_dark_oak_3x3
malisisdoors:big_door_iron_3x3
malisisdoors:big_door_jungle_3x3
malisisdoors:big_door_oak_3x3
malisisdoors:big_door_rusty_3x3
malisisdoors:big_door_spruce_3x3

You might need to blacklist others as well, probably the carriage and mediaeval doors, possibly some of the smaller custom doors. If in doubt, I'm pretty sure it's safe to just blacklist malisisdoors.* altogether.

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¹ Well, I wasn't actually trying to sneak through the door, you understand. But a few times I've been on a steep flying descent, precision approach, landed RIGHT in front of the door, clicked to open it with shift still down, and found myself holding the door. Oops. Took me three or four times to realize what was happening.

Reported by CaerMaster