You are using something that is part of a lua script I believe…
As it exports and then re-imports I wonder if this is when the information is lost as its being treated like a new file on import?? I have no idea but you would need to look at the code I guess to see and manually replicate the steps…
Edit:
It seems like there is code in the script to save and restore the tags, rating and colors labels… if I read it correctly but maybe something has changed that impacted this function in the latest DT??
– save image tags, rating and color
local tags = {}
for i, tag in ipairs(dt.tags.get_tags(image)) do
if not (string.sub(tag.name, 1, 9) == “darktable”) then table.insert(tags, tag) end
end
local rating = image.rating
local red = image.red
local blue = image.blue
local green = image.green
local yellow = image.yellow
local purple = image.purple