plugin-react-refresh 1.3.0 causes "Support for the experimental syntax ... isn't currently enabled"

[mape]

After upgrading plugin-react-refresh from 1.2.2 to 1.3.0 I started getting errors with my React class components using MobX and @observer decorators.

@vitejs/plugin-react-refresh": "1.2.2"

Works as expected, no errors.

@vitejs/plugin-react-refresh": "1.3.0"

xx:xx:xx [vite] Internal server error: path\file1.tsx: Support for the experimental syntax 'classProperties' isn't currently enabled (27:17):
xx:xx:xx [vite] Internal server error: path\file2.tsx: Support for the experimental syntax 'decorators-legacy' isn't currently enabled (26:1):

Temporary fix

Removing enforce: 'pre', inside packages/plugin-react-refresh/index.js makes the code compile again:
4037c55#diff-e6fc286e2eecd57ae2d4ddbe88fda7c47fdce8fb2011a712dab756dda4ea8131R44