Tagging a user gives me an argument error

[archetype2142]

On v1.4.2, when a new user is added, and I tried to tag them in a message, I get the error "Content missing"

here's trace from logs

I, [2025-12-09T00:02:13.830447 #54]  INFO -- : [66da4043-f564-4964-b934-9cade5729adb] Started POST "/rooms/29/messages" for 83.175.189.211 at 2025-12-09 00:02:13 +0000
I, [2025-12-09T00:02:13.831292 #54]  INFO -- : [66da4043-f564-4964-b934-9cade5729adb] Processing by MessagesController#create as TURBO_STREAM
I, [2025-12-09T00:02:13.831341 #54]  INFO -- : [66da4043-f564-4964-b934-9cade5729adb]   Parameters: {"authenticity_token" => "[FILTERED]", "message" => {"body" => "[FILTERED]", "client_message_id" => "xxx"}, "room_id" => "29"}
I, [2025-12-09T00:02:13.839837 #54]  INFO -- : [66da4043-f564-4964-b934-9cade5729adb] Completed 500 Internal Server Error in 8ms (ActiveRecord: 0.7ms (6 queries, 1 cached) | GC: 0.0ms)
E, [2025-12-09T00:02:13.845634 #54] ERROR -- : [66da4043-f564-4964-b934-9cade5729adb]
[66da4043-f564-4964-b934-9cade5729adb] ArgumentError (invalid base64):
[66da4043-f564-4964-b934-9cade5729adb]
[66da4043-f564-4964-b934-9cade5729adb] lib/rails_ext/action_text_attachables.rb:15:in 'ActionText::Attachment.attachable_from_possibly_expired_sgid'
[66da4043-f564-4964-b934-9cade5729adb] lib/rails_ext/action_text_attachables.rb:5:in 'ActionText::Attachment.from_node'
[66da4043-f564-4964-b934-9cade5729adb] app/models/message/attachment.rb:15:in 'Message::Attachment::ClassMethods#create_with_attachment!'
[66da4043-f564-4964-b934-9cade5729adb] app/controllers/messages_controller.rb:22:in 'MessagesController#create'
{"time":"2025-12-09T00:02:13.849071686Z","level":"INFO","msg":"Request","path":"/rooms/29/messages","status":500,"dur":21,"method":"POST","req_content_length":1902,"req_content_type":"application/x-www-form-urlencoded;charset=UTF-8","resp_content_length":1690,"resp_content_type":"text/html; charset=UTF-8","remote_addr":"x.x.x.x","user_agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36","cache":"bypass","query":""}

[poondq]

same error as what i am facing

[monorkin]

Let's move this to #135 so that there is a single thread for this bug.