I found a glitch that is usefull for scanning blast doors you missed. I only noticed this once so it might be a one time thing.
In the room where you first fight Spire (High Ground) I got into a battle with a few gaurdians. I went to the door that would normally lead to Alimbic Gardens so I could snipe the Guardians out from afar. I had already beatne the game at the time (today) and was searching for the remaining scans (2 lore and 1 object remaining), when I looked at the door I noticed that it was not only locked but it had a purple blast shield on it (judictator). I scanned it to see if it would just bring up the sealed door scan but it brought up the purple door scan, if someone missed a door or two, this should work in letting you scan them during a hunter/guardian battle.
When the battle was finished the purple door changed back into a regular door.
In the room where you first fight Spire (High Ground) I got into a battle with a few gaurdians. I went to the door that would normally lead to Alimbic Gardens so I could snipe the Guardians out from afar. I had already beatne the game at the time (today) and was searching for the remaining scans (2 lore and 1 object remaining), when I looked at the door I noticed that it was not only locked but it had a purple blast shield on it (judictator). I scanned it to see if it would just bring up the sealed door scan but it brought up the purple door scan, if someone missed a door or two, this should work in letting you scan them during a hunter/guardian battle.
When the battle was finished the purple door changed back into a regular door.