Landscape mobility changed to movable

so im using matinee and trying to make a cinematic but in the middle of the work an error poped up in bottom right corner saying: (landscape mobility0 changed to movable) and just ruining the landscape like when ever i click on anything but landscape my landscape become wierd and unusable idk how to describe it so i closed ue4 and opened it again…and this time the same thing happened less than 3 mins…and this time when i click on something…the landscape instead of becoming wierd is just disappearing and when i click back on it it just becomes normal i really really have to finish my job in less than 2 days please help and im using UE4.20.2 BTW

never mind i found out the solution and why this problem appears…
its because of matinee…when i use matinee and when its open i should not click on anything except cameras if i click on an asset that asset will become movable…normally its not a problem because we can change the mobility in the settings but some other things like landscape…we cant change the mobility…

solution: i had to close the matinee (and if the thing that became movable is something like landscape that we can change it back to stable we have to restart the ue4…i didnt saved anything because i thought its a bad idea…but idk)make another matinee and be careful this time when matinee is open do not click on anything but cameras especially the landscape if you clicked on them then close matinee because you have like 45 seconds until that thing becomes movable

i guess its some sort of bug because there wasnt anything like this in ue4.16

hello this is really weird and it looks like Epic guys dont want to make this fixed! I have the same issue, some how, landscape is addedto my level ssequencer and however i remove it , it is still movable ! Is there is good fix for it ?