Hi , This seems to have more than the single issue i have found, please download my debug project (materialinstancebug.zip) below, go into Test_Mat_Inst and set a value in TRYSAVEME save it and close it then reopen it, you will see the saved parameters is lost but then again it seems to be saving it to the above parameter? so it seems there’s more than just lost save data going on here, now i thought it mite of been because there no feed back from these to main node, but then again in the 2nd debug project (materialinstancebugtest2.zip) it is but instead this time its not saved in the above parameter its just not saved at all.
I hope these debug projects help.