The easiest way to rule out PocketBase issue is to try the filter in the Admin UI.

If you are constructing the request manually, the filter query parameter must be properly URL encoded, aka. in your case the valid query parameter should be:

?filter=title~%27abc%27%20%26%26%20created%3E%272022-01-01%27

Also note that the full-date time format is Y-m-d H:i:s.uZ, so a more precise date constraint could be:

// adjust the date depending on your requirement
?filter=title~'abc' && created>='2022-01-01 00:00:00.000Z'

// url encoded version:
?filter=title~%27abc%27%20%26%26%20created%3E%3D%272022-01-01%2000%3A00%3A00.000Z%27

For more detailed error messages you could also start the executable with --dev and/or find the failed request in the Admin UI > Logs.

If the above doesn't help, please export your collections configuration as json (Admin UI > Settings > Export collections) and provide a minimal code sample how you are sending request.