What version of Hugo are you using (hugo version)?

v0.146.2

Does this issue reproduce with the latest release?

Yes

The problem

When I put 2 files in the same folder, if they have a "." in the name, in addition to the one that separates the extension, the text before that first "." cannot be the same.

The result

This did not happen in version v0.145.0.
This was introduce in commit 83cfdd7 (Reimplement and simplify Hugo's template system)

Sorry for my bad English.