I have been using the Yak-130 in simulator and i have noticed the CCIP HUD marker and the SPI HUD marker are not visible when using bombs only but if i use i a preset with rockets and bombs i have both the rocket CCIP HUD marker and Bomb CCIP HUD marker and switch between CCIP/CCRP works fine, im not sure if this is a bug or intended feature.
Have you tried manually switching the sight modes?
Switching between sight modes only seems to work with the preset Rocket/Bombs
then I guess its a bug