@sallymorganmoore sorry for bothering you, but since this issue is being ignored since Odyssey release I'll post it here.
In Odyssey there is a bug with gathering materials from Brain Trees (see screenshot). Only small fraction of materials (~10%) can be shot from them.
In Horizons there were much less material occurences in biological sites. Could be that only each 10th had a material attached.
Could it be that in Odyssey some of spawned instances are missing some attribute, making them "unminable" or just issue with hitbox or something.
Anyway it makes it very hard to do the same activity in Odyssey, which forces many players to launch Horizons for mining materials.
I hope that this issue will be fixed in the near future!
It would be great if FDev consider to make gameplay loop more rich - e.g. making those non-minable materials somehow marked (e.g. color/intencity on the radar), so they require to be mined on-foot. It could be clusters of such instances around 1-2 of normal ones (minable from SRV).