FAA regulations don’t tell you everything you need to know to handle every situation, including IFR lost communications. Often you have to look beyond the rules for guidance.
The rules for lost communications while operating IFR are specific and detailed, but they don’t tell the whole story. Here’s some
Galvin CFII Bruce Williams shares some practical advice on that topic from the FAA that you won’t find in 14 CFR §91.185.