Conversion instances are executed beyond the number of parallelLimit

[logue]

The conversion process (ImageMagick, GraphicsMagic) will be executed regardless of the value defined by parallelLimit.
Perhaps it doesn't make sense because the next process runs before the above process ends, or it runs out of memory endlessly.

The image to be tiled is a 32-bit PNG of 12288x12288 with a capacity of about 7.34M, but the memory will be exhausted from around 25% and the operation will not be accepted until 1 hour when the processing is completed.