Single spa not working properly in DEV

Bug: Single spa projects not running correctly and throw errors when try to run start/stard:standalone scripts.

When i put --mode=production, then it works fine.

"start": "webpack serve --port 9001 --env isLocal --mode=production",
"start:standalone": "webpack serve --port 9001 --env standalone --mode=production",

When i put these in package json it works.

Error: dispatcher.getOwner is not a function