Hi Lothena1685,
the reason for the change is a good one - but sounds a lot like "Mapping for the renderer".
https://wiki.openstreetmap.org/wiki/Good_practice#Don't_map_for_the_renderer
Looking at the definition of "optional_sidepath" .. I can not see a separate marked line for bikes. 
So switching bicycle from designated to yes seems to be the right approach.

https://wiki.openstreetmap.org/wiki/Tag:bicycle%3Doptional_sidepath
https://www.mapillary.com/app/?pKey=804084257525842&focus=photo
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            Published using OSMCha: https://osmcha.org/changesets/161489165
            