"Partition 'assets' not found" while patching firmware

[flix42]

After solving the container issue i am running into another one while patching the firmware.
After the webserial way failed to read the firmware i dumped it using esptool.py and patched the firmware the "old" way, but i was running into the "Ameise" bug and could not get the box to connect to any cloud.
I reverted back to my backup and factory reset the box. After updating the firmware i tried the webserial method on a different PC and this time it successfully read the firmware, but patching failed.
Relevant log from the container:

INFO |handler_api.c:1117:file_save_start_suffix| Writing to '/teddycloud/data/firmware/ESP32_d48afca6cd2c_2.bin'
INFO |server_helpers.c:0484:multipart_handle| Received file 'ESP32_d48afca6cd2c'
INFO |handler_api.c:1180:handleApiESP32UploadFirmware| Received new file:
INFO |handler_api.c:1181:handleApiESP32UploadFirmware|   '/teddycloud/data/firmware/ESP32_d48afca6cd2c_2.bin'
INFO |handler_api.c:1354:handleApiESP32PatchFirmware| Patch firmware
INFO |handler_api.c:1375:handleApiESP32PatchFirmware| Patch hostnames 'teddyone.grossesser.com'
INFO |handler_api.c:1400:handleApiESP32PatchFirmware| Request for '/teddycloud/data/firmware/ESP32_d48afca6cd2c_2.bin'
INFO |esp32.c:1737:esp32_inject_ca| Writing CA into '/teddycloud/data/firmware/cert_d48afca6cd2c//ca.der'
INFO |esp32.c:1754:esp32_inject_ca| Convert CA certificate...
INFO |esp32.c:1792:esp32_inject_ca| Injecting CA into '/teddycloud/data/firmware/patched_d48afca6cd2c.bin'
INFO |esp32.c:1380:esp32_get_partition| Search for partition 'assets'
ERROR|esp32.c:1414:esp32_get_partition| Partition 'assets' not found
ERROR|esp32.c:1637:esp32_fat_inject| Asset partition not found
ERROR|esp32.c:1795:esp32_inject_ca| Failed to patch image
ERROR|handler_api.c:1428:handleApiESP32PatchFirmware| Failed to generate and inject CA
WARN |server_helpers.c:0806:httpServerUriNotFoundCallback|  >> 404 /api/esp32/patchFirmware

The interesting bit is: If i dump the firmware using esptool.py and use the old method it does find the assets partition and produces a flashable firmware.
Unfortunately this one also fails to connect...
But i think it does try to connect:

INFO |handler_cloud.c:0041:handleCloudTime|  >> respond with current time
INFO |mqtt.c:0685:mqtt_init_box| Skipping client 'Toniebox' (cn: 'default')
WARN |tls_server_fsm.c:0260:tlsPerformServerHandshake| TLS handshake failure!
INFO |cloud_request.c:0178:web_request| Cloud requests generally blocked in settings
ERROR|handler_reverse.c:0029:handleReverse| cloud_request_get() failed
INFO |cloud_request.c:0178:web_request| Cloud requests generally blocked in settings
ERROR|handler_reverse.c:0029:handleReverse| cloud_request_get() failed
INFO |cloud_request.c:0178:web_request| Cloud requests generally blocked in settings
ERROR|handler_reverse.c:0029:handleReverse| cloud_request_get() failed

Any suggestions?