Baseball been bery bery good to me
This is a picture of a published game designer
As the game progressed, we had a situation come up I had not seen before and could find no ruling for. One player was holding six founding tiles but all chains were already active. In the end we decided she simply could not play a tile, but was of course permitted to purchase stock.
That was covered since the mid-1960s in the 3M edition. I think there were three different versions of the rules with (C) 1963 on the box, and this was in the third if not earlier. It specifically says the player with six temporarily unplayable tiles does not place a tile but may buy stock.