I have a simple Script-controlled garbage pail, a chest with a sign above it. Up to Spigot 1.10, the following action worked. When I right-click on the chest to transfer items to it, the indicated line changes; there is similar logic on left-click to empty the chest. With Spigot 1.10.2 and no plugins changed, all four lines of the sign are empty following either click action. There are no messages to the log indicating error (or anything else).

// the block above the clicked block is a sign
...
                if line 2 of the block above the clicked block is "GARBAGE":
                        set line 4 of the block above the clicked block to "LOADED"

I appreciate that Skript is old and unsupported, and irrelevant to Spigot per se, but Spigot 1.10.2 or upstream 1.10.2 broke this feature. Can something be done?