Do you (gently) pull out the standard after unfolding? Usually, it won't snap completely into place after all these years, and needs a bit of help. It is quite normal that the front standard wiggles a bit even after pulled out - the folding mechanism usually shows some traces of wear.
As long as the lens doesn't drop out of parallelity for more than one or two millimeters and ends up in the same plane every time you open the camera or focus, it is better to do nothing about it. You can compensate for any eventual lens shift by readjusting the rangefinder.
More critical on the Bessa RF is that many people miss the hidden fold-in tab and break the folding mechanism in some attempt to close it by brute force - I've nearly bought one destroyed by the seller in a last "test" while packing.
In such a case, the standard won't merely wiggle, but literally flap around, or won't raise any more. Usually, such a broken standard cannot be brought back to a reasonable degree of reliability without making new parts, as some of the tabs and guides get shorn off when forced. In such a case, the camera is only good as a spares carrier for another camera with working mechanics, but damaged bellows, optics and shutter.