Mobile data not working on dual sim after reboot or flight mode

Hello,

I have a physical SIM from Vodafone and an eSim from fraenk (Telekom/Congstar). I used this setup in the past with handyvertrag.de as eSim without any problems.

Since the change to fraenk, my mobile data on fraenk won’t connect after a reboot or en/disabling flight mode. It either shows 5G with an exclamation mark or no symbol at all (but with full signal and phone calls are also possible)
I can fix this by either disabling fraenk eSim and activate it again or by changing the network mode to 2G/3G or 2G and then change it back to 5G/4G/3G/2G.

This problem does not appear, when my physical sim card is disabled.

Anyone got any clue, why this is happening and how I can resolve the issue further?

Fairphone 4, Android 13, Kernel 4.19.157-perf+, Build FP4.TP2l.C.0121.20240626

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