Sure, you are correct that this is a problem for you with /e/OS, but I believe the logic is flawed.
I cannot prove this accurately in code, so please treat this as speculation. I have noticed that while apn became more and more complicated say 2 years ago, APN have become abbreviated by some carriers since then, especially it seems to me in the case where one pays a “sub-contracting organisation” rather than the mainstream carrier itself. (Like me, I pay Asda, the carrier is Vodafone.)
In this case I believe “Google’s little helpers” can facilitate this redirect, while the redirect is not in AOSP. You might check your carrier against the values used in /e/OS system prebuilt/common/etc/apns-conf.xml · v1-t · e / os / android_vendor_lineage · GitLab (the intended link points to Android 13 (T)).
[LIST] Carriers that work or do not work with /e/OS country-wise