More specifically, overwriting an existing action layer and trying to change allowFallthrough from what it already was to the opposite is not supported.
...
Again, it is only a problem if you try to change the value of allowFallthrough.
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"what it already was to the opposite" or "Change" means:
if true, do no set it to false (or other values that might even fail to work at all then
)
if false, do not set it to true (or other values that might even fail to work at all then
)