Old routes can no more be edited

Dear Lady, Sir,

I work with routes, that I first determine roughly and finetuning is done later. Until your last app update this was easy. E.g. just tap on the route and add, delete, change waypoints.

But beginning with your newest version the following happens.

When trying to edit an route, that last was edited with your former version, the route vanishes. All waypoint disappeare. I get a fresh screen with the option to enter start- and endpoints.

I think, this is a bug in your program. I will appreciate anyway a helpful answer.

Best wishes, Wolfgang