Functions only consider the value of the gamerule maxCommandChainLength when the function starts, but should ignore any changes to it while the commands are running, see
However, this is not the case when a nested function is executed. In this case the length of the queued commands is compared with the current maxCommandChainLength value.
- Download the attached datapack MC-143266.zip and place it in the datapacks folder of your world
- Run the function test:run_nested
→ It did not run any of the commands from the test:nested function; you can slightly increase the value set for maxCommandChainLength in test:run_nested and the nested function will be executed
See net.minecraft.advancements.FunctionManager.execute(FunctionObject, CommandSource) (MCP name)
Solution: The maxCommandChainLength value could be stored in a field when the execution of a function starts and then the value of the field can be used for nested functions.