While true, doppler processing isn't the only mode on a LOT of radars. A coherent monopulse, multimode/multi-PRF radar can lock on a nonmoving target quite quickly. In the ideal case, a radar monopulse comparator (Sum, Delta Az/Delta El) can see and angle locate a target with one pulse
My guess is if the radar operator knows that the target is a drone they will not use doppler mode. Or perhaps they would cycle between modes.
We seeing a lot of drone video where the folks on the ground don't know they are being tracked by a drone.
IMHO, drone warfare (or drone capabilities) is one of the biggest lessons of this war.
Interesting article:
Iran Just Delivered Hundreds (400) Of Iranian Ballistic Missiles To Russia: Report
An infusion of proven ballistic missiles into Russia comes as Ukraine’s Patriot air defense systems’ long-term viability is being questioned.
Patriot batteries may soon run out of missiles unless the House GOP relents. There is no long-term sustainment plan.
https://www.twz.com/land/iran-just-delivered-hundreds-of-iranian-ballistic-missiles-to-russia-report