WCH CH224K Fast-Charging Protocol Chip: Function Changed but Model Number Remains Unchanged?

Has WCH Changed the Functionality of the CH224K Fast-Charging Protocol Chip Without Changing Its Model Number?

In the 1F version of the datasheet, the CH224K supports single-resistor mode for configuring the requested voltage. In this case, leaving all CFG pins floating would trigger a 20V request.

CH224K_V1F datasheet download link: https://url.zeruns.com/WCH-CH224-V1F

However, in the V2.1 version of the datasheet, the single-resistor configuration section for CH224K was removed. Instead, it only supports high/low-level configuration for voltage requests, and the CFG pins can no longer be left floating.
This essentially means that if the actual chip revision has changed, then all CH224K circuits that were designed to request 20V using the single-resistor (floating) method would stop working, right?

CH224K_V2.1 datasheet download link: https://url.zeruns.com/WCH-CH224-V2_1

Then, in the updated manual, the CH224K section recommends migrating to the CH224A chip. The CH224A's pinout and functionality are almost identical to the CH224K, and it also supports single-resistor mode for configuring the requested voltage. But for 20V request voltage, the required configuration resistor is 120kΩ, unlike the previous floating setup. If your circuit design doesn't have a reserved resistor pad, you won't be able to replace it directly!

Is WCH's approach here reasonable? Shouldn't a chip revision with such a functional change come with a new model number?

Has anyone tried buying the new CH224K recently to see if it still supports single-resistor configuration?

Some of my earlier open-source projects used CH224K to request 20V through single-resistor mode with all CFG pins floating, without reserving any pads for configuration resistors.

CH224K purchase link: https://s.click.taobao.com/VDx5vFq

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