MC-146163] T-flipflop works inconsistently when build. When copied/pasted with a structure block, working flipflops may become broken and vice versa - Jira
Swap Levers with Sophisticated "T Flip-Flop" Buttons in This Saturday's Minecraft Workshop « Minecraft :: WonderHowTo
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Redstone Question! (1x3x2 T-Flip Flop almost) - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
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How to Build a T Flip-Flop in Minecraft « Minecraft :: WonderHowTo