Yeah that's odd. I loaded up a brand new infinite save, went straight there, arrived about 1:30 and the shrub just sits there. I hung around until the birds started chirping at about 5:30, just in case the timing was off.
Viewing post in Voices of the Void 0.8.2 Bug Reports
Yeah a Streamer I was watching had this issue when we tried guide them to the Slabs/Tablets, and another chat member also reported no Red Bush activation. Again I'm not sure if this is intended but doesn't make any sense to have it not activate for Infinite Mode when every other event should be able activate. So on one hand glad it's defiantly common occurrence and not just use, on the other hand hoping it's not intentional and it's just a bug.