No strongholds will generate in a superflat world, despite them being specified in the exported world JSON. /locate fails.
If both old-style (i.e. stronghold, distance, count, spread) and new-style (i.e. minecraft:stronghold, spacing, separation, salt) stronghold structures are specified in the generation JSON then the /locate command and eyes of ender will point to locations in the world, but those locations will not contain strongholds.
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However, we are already tracking this issue, and this report is a Duplicate of MC-187357.
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