No problem, it's an easy thing to miss as outside of casting spells it's up to the DM to decide. I'm also considering NPC thri-kreens here, I should state.
Where can I read about the UA version of Telepathy? I'd hope that they figure out a way for thri-kreen telepathy to either work without willing recipients, or for a line noting that a telepathic creature's efforts to communicate will be recieved by the target, as a sort of presence in their mind, even when they're unwilling - simply to make sure that it's not an all-or-nothing ability.
Telepathy is in the glossary of the Druid/Paladin UA. I’m assuming since they are putting it in the rules glossary it will be standardized across features/creatures/species
That makes sense. OK I read it, and I still think specifics beat out general, so a Thri-Kreen's telepathy that required a willing recipient would be the specific that overrules the general rule - they either have to put out an errata or change the language for the Thri-Kreen. I say that since the UA does not address what change was made or why, but most importantly it doesn't say to ignore other sources.
That makes sense.
OK I read it, and I still think specifics beat out general, so a Thri-Kreen's telepathy that required a willing recipient would be the specific that overrules the general rule - they either have to put out an errata or change the language for the Thri-Kreen. I say that since the UA does not address what change was made or why, but most importantly it doesn't say to ignore other sources.
The description of Thri-Kreen telepathy does specifically state the creature must be willing. That does potentially pose a problem.