Can't get altitude telemetry from barometer

[TGS78]

Hi! Can someone please help me figure out why I'm not getting barometer altitude telemetry?
If I read correctly, the altitude should now be transmitted even without GPS.
Telemetry in Betaflight is enabled and the configurator as well as the OSD show altitude from barometer.
Below the sensors I get with autodetect on my RC:

1RSS(dB)
2RSS(dB)
RQly(%)
RSNR(dB)
ANT
RFMD
TPWR(mW)
TRSS(dB)
TQly(%)
TSNR(dB)
FM
RxBt(V)
Curr(A)
Capa(mAh)
Bat%(%)
Ptch(rad)
Roll(rad)
Yaw(rad)

RC: Jumper T-Pro V2 EdgeTX (tprov2-v2.10.3) with ExpressLRS 3.4.3
FC: HM CrazyF405HD (betaflight_4.5.1_STM32F405_BETAFLIGHTF4_1956d278), BMP280 Barometer, ExpressLRS 3.4.3

I'm new in FPV and do not know where to start searching the issue...
And an additional question: the telemtry setup screen counts (19) sensors while collapsed, but lists only 18. Why?