Bismuth is still there, as you can see here: https://coinmarketcap.com/currencies/bismuth/ but since it doesn't have any active market listed on CMC the search engine is skipping it.

Or at least this is what I think since is having the tag inactive.

Here is another CMC like site where you can track Bismuth (have qTrade market added): https://coinpaprika.com/coin/bis-bismuth/