Question about "chatty" in mms of L5

I have a question about “chatty” in mms of L5.

As far as I read this page, there are two APNs.
One for mobile and one for MMS.
APN for mobile is APN
APN for MMS is APN
Why is it still not working?
Should I hack and rewrite my files directly? ?

name Y!mobile APN
username ym
password ym
MCC 440
MNC 20
authentication type CHAP
MMSC http://mms-s
MMS proxy
MMS port 8080
APN type default,mms,supl,hipri

Maybe the issue mentioned here: State of MMS on Librem 5

Maybe someone with an up-to-date phone can say what the current state of this issue is.