Core 2.33 receive_imf failure

[link2xt]

❌ Failed to receive a message: error in Secure-Join message handling: failed sending auth-required handshake message: Failed to create send jobs: No recipient keys are available, cannot encrypt to ["xxx@gmail.com"].. Please report this bug to delta@merlinux.eu or https://support.delta.chat/.

App version is Delta Chat 2.33.1-foss, so using core 2.33.

[link2xt]

I opened #7619 so we don't have to ask users for core version each time.

[link2xt]

Previous failure: #7554 (2.25)
Another one: #7478 (2.33)
#7594 was merged after 2.33, in 2.34, but does not look like fixing this problem.