My CT4 2022 has a similar issue.
After about 10,000km, mainly charged from home at low 7.6 Kw.
Apparently it is a part inside the VW metallic box, probably the AC charger, just below that green lock. That will be replaced.
I was surprised to see so much complexity under the hood.
I tried various timer config, and had the charging error too.
Finally I settled on just using the Timer set to 6:30AM, 85% target charge
I often get multiple notifications from the Pulsar saying the charging ended, just after plugging in and randomly later.
And Porsche Connect notifications...