My Samsung A42 has many issues receiving text messages. Some come in fine. Some come in and show "downloading" for several minutes before opening. Some come in and require clicking a "download" button to trigger the download before opening. Some others never come in and are lost permanently with no record of ever receiving them. If the "stuck dowloading" messages are part of a group text, they get stuck in my inbox from the individual sender rather than my group text inbox. If you find it there and are able to download it, it will dissappear from that inbox and show up in the group text box where it belongs  when finally downloaded. I know of at least 4 other people with other Samsung phones A32/A42/A52..) having exact same issue and all have different service providers.  I have been attempting several times to speak with Samsung tech support, but this is getting nowhere. It seems the issue is very well known. I have missed several important text messages that I found out about well after sent and believe still many others lost without me ever  knowing. Please respond if you are having this issue to help get this resolved.