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just upgraded to 2023 and am using a 2022 project to upgrade and am running into a few quirks.

first one is:
Slim \ Exception \ HttpNotFoundException (404)
Route 'index.php' not found.

as well receiving this

then am gettng a few crypto errors as well:
defuse\crypto\exception\WrongKeyOrModifiedCiphertextException with
message integrity check failed

ignore:
with message bad version header @cryto line 313

above error 4 times then
back to integrity check failed

chiphertext is too short @ crypto.php 304

the "index page" appears with the route index.php not found - no menu or login prompts.

didn't really change anything for this to happen

Since v2021, there is no need to call filename in URL. Just call the route in the URL (without .php extension file).