Call to protected method ApiPlatform\\Doctrine\\Orm\\Filter\\SearchFilter::splitPropertyParts() from scope ApiPlatform\\Doctrine\\Orm\\Filter\\AbstractFilter

[germi]

API Platform version(s) affected: 4.0

Description
When I try to filter by a relation, ie &relation.id=2 it throws this error. Yesterday it was working just fine, there hasn't been any changes related to this. Today it throws the error. Unexplicably. Running PHP 8.3.13

How to reproduce
This is what the ApiFilter attribute looks like

#[ApiFilter(SearchFilter::class, properties: [
    'municipality.id' => 'exact',
    'municipality.municipality_code_6' => 'exact',
    'municipality.municipality_code' => 'exact',
    'indicator.target.target_id' => 'exact',
    'indicator.indicator_id' => 'exact',
    'indicator.id' => 'exact',
    'year' => 'exact'])]

when I filter by year (simple filter) it works. but if I filter by a relation, for example municipality.id, it breaks.

Possible Solution

Additional Context
I tried on another computer, same PHP version, all the same, and it works. But in my current computer, where it was totally working yesterday, now it throws
Call to protected method ApiPlatform\\Doctrine\\Orm\\Filter\\SearchFilter::splitPropertyParts() from scope ApiPlatform\\Doctrine\\Orm\\Filter\\AbstractFilter