run dmesg | grep wwan0
If you see something like 
[ 6124.624566] rndis_host 5-1:1.0 wwan0: register 'rndis_host' at 
usb-0000:0b:00.4-1, Mobile Broadband RNDIS device, f2:00:f5:90:be:3a
[ 6124.631938] rndis_host 5-1:1.0 wwp11s0f4u1: renamed from wwan0

Then it is https://bugzilla.kernel.org/show_bug.cgi?id=220002

And for me it still broken since 6.14.0-15-generic , I can't upgrade to
any next kernel version as it breaks RNDIS USB tethering

** Bug watch added: Linux Kernel Bug Tracker #220002
   https://bugzilla.kernel.org/show_bug.cgi?id=220002

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https://bugs.launchpad.net/bugs/2115555

Title:
  USB tethering broken in kernel 6.11.0-28 (works fine in 6.11.0-26)

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