Just do not try to manually disable (
^) the feature, then. You already are trying to create a volume exceeding what is possible without it. Adding ability for the file system to be larger than 16TiB (at 4k blocks) is the one and so far (almost) only point of the option.
I suspect you are confusing the 64 bit option for something else. From man 5 ext4:
Enables the file system to be larger than 2^32 blocks. This feature is
set automatically, as needed, but it can be useful to specify this
feature explicitly if the file system might need to be resized larger
than 2^32 blocks, even if it was smaller than that threshold when it
was originally created. Note that some older kernels and older
versions of e2fsprogs will not support file systems with this ext4
If the script that attempted the operation was not written by you: Consider another explanation for why it is there: the author of the script wanted to make this operation fail, because she knew that whatever it sets up will not work properly or reliably with a volume of that size anyway. You might be trying to use a software at a scale it was not expected to be operated under.