Markings Disappear after awhile even if saved

[rsjury]

Which IMT are you using? Stable, BETA, BETA with Early Access Stable

What computer OS are you using? (ex: Linux (version), MACOS, Windows (version)) Windows 10

Describe the bug I add markings to streets, then make other changes (Zone, build roads, etc.) but after awhile when I go back to the areas where I used the marking tool it has disappeared. I have tested this by re-adding them and saving but they still disappear.

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