At worse you would talking about a few barely visible fibres, if a section of cloth or paper was stripped off after getting caught in the cut outs of some dipsticks only a lunatic would stuff anything so obvious back down the dipstick hole.

The more interesting issue about correct oil level checking is when it should be carried out, on both our Japanese cars it's recommended to check the level with the engine at normal operating temp some 5 mins after stopping the engine...lots of people do not know when is the right time to check their level, worth reading the manual.

So in short, we can safely say that using a paper tissue is fine for a dipstick and even if part of the paper somehow ended up in the sump, it would get filtered out anyway by the oil filter which would then be replaced yearly during a service?

Things dropped down the dip-tube end up in the sump oil (which the dipstick measures). Oil in the sump is strained for large objects before being pumped through the filter, It's clearly not clever to drop anything solid down, but even then no damage should result.