Cloaked colony ships can't colonize!

[Q]

I noticed that cloaked colony ships can't colonize a planet in SE IV Version 1.49. No problem for humans but I saw the Aquilaeian colonization completely stopped due to this because their colony ships had activated stealth armor and the AI did not decloak the ships over several turns when they arrived at their target planet.

[Q]

I believe I found the reason why the AI did not uncloak the ships: all ministers were on duty except the "Automatically use Individual Minister for newly built vehicles". As said, using all other ministers the ships did not uncloak for several turns and couldn't colonize the planets. However after turning the empire back to a complete AI player the colonization was successful. I can't repeat it, but probably the effect would have been the same when activating the minister for individual ships.