At the moment I have to charge my battery with an external charger, which is not ideal. Here are some facts about my problem.
cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent showsPOWER_SUPPLY_ONLINE=0
POWER_SUPPLY_PRESENT=0
Even though you can flash new images, it might still be worth to try charging with a different cable, and with a different charger, and with the cable rotated the other way. I had a cable that seemed to work one way but not the other.
You could also check that “sudo dmesg -w” says when the charging cable is connected. For me, that shows the following lines repeated a few times:
[29910.728018] bq25890-charger 3-006a: Upstream supply changed: 1.
[29910.728041] bq25890-charger 3-006a: Disabling OTG_EN pin
Maybe also check for any messages involving “bq25890-charger” in the journalctl log.