"Fixed up invalid landscape material instances. Please re-save" error CRASH

I work on my own project in two pcs with Azure DevOps repository. All went good until now. I get this error because i put some holes in the landscape to make a cave. I started getting these when i created and added the Landscape Hole Material.

I don’t know how can i re-save the external actors.
I don’t know if it’s because of those errors but in my high-end pc Unreal Editor crashes almost immediately once i start it, meanwhile in my low-end pc i can stay editing the level for ages. The map check says 0 errors/warnings but it crashes… I need help so i can keep on working remote and collaborative, thanks in advance!

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I have the same here, wish somebody would post a fix.

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Did you fix or give up stil getting these.

thx

Still getting these , mate! Im into other issues right now but will try to solve this issue again soon…

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Same here in 5.6 and 5.7, LandscapeStreamingProxy_1_0_0 Fixed up invalid landscape material instances. Please re-save /Game/ExternalActors/ThirdPerson/Maps/ThirdPersonMap/7/ER/1PX8ONS4CLAHZXIM1VJKQL.

I am having same issue, anyone have a fix? help us!!!

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Same here, LandscapeStreamingProxy_2_4_0 Fixed up invalid landscape material instances. Please re-save /Game/ExternalActors/ThirdPerson/Maps/ThirdPersonMap/B/IH/9A8Y20JCKVPNHRMG60TY0A. ,

This engine has its share of bugs, I guess they FIX what they feel like, like better’ features’, and let everything else GO . I love the engine, WISH undo was tons better, its just awful, but these errors are egregious and us, devs and others, think something else is wrong, which could lead to far worse issues going fwd.