[Solved] Dark text on HD44780 blue LCD display with I2C converter connected to NodeMCU

I have connected a blue display to the NodeMCU with an I2C converter. The text is displayed, but not in the typical light color, but it is like a dark shadow. When the power supply is interrupted for a moment during operation, it starts to display bushes, which is obvious because it is not configured correctly, but they already have the correct color, when in this situation the begin() or init() method is called (depending on the library) the dark text returns. .
What is the problem, does it mean the display or converter is faulty? Does anyone have a similar experience, an idea how to fix it?

Did you adjust the contrast?

Yes, this incorrect color is displayed at maximum contrast, when reduced, absolutely nothing is visible. When the painted bushes are displayed correctly the contrast adjustment works correctly.

How did you connect the level converter to the NodeMCU (schematic diagram) ? I understand that you supply the display from 5V ?

Converter factory connected to the display, I corrected all the solders, apparently there was a high resistance somewhere.