I spent some time learning how Blueprints work yesterday and came up with this modification of the original. Note this has only been tested with the v1 remote as that’s all I have but it restores functionality to all buttons for me.
blueprint:
name: ZHA - Philips Hue Dimmer Switch (Fixed)
description: 'Control lights with a Philips Hue Dimmer Switch.
The top "on" button will turn the lights on to the last set brightness
(unless the force brightness is toggled on in the blueprint).
Dim up/down buttons will change the brightness smoothly and can be pressed
and hold until the brightness is satisfactory.
The bottom "off" button will turn the lights off.
'
domain: automation
input:
remote:
name: Philips Hue Dimmer Switch
description: Pick either RWL020 (US) or RWL021 (EU)
selector:
device:
filter:
- integration: zha
manufacturer: Philips
entity:
- domain:
- sensor
device_class:
- battery
multiple: false
light:
name: Light(s)
description: The light(s) to control
selector:
target:
entity:
- domain:
- light
force_brightness:
name: Force turn on brightness
description:
'Force the brightness to the set level below, when the "on" button
on the remote is pushed and lights turn on.'
default: false
selector:
boolean: {}
brightness:
name: Brightness
description: Brightness of the light(s) when turning on
default: 100
selector:
number:
min: 0.0
max: 100.0
mode: slider
step: 1.0
unit_of_measurement: "%"
source_url: https://community.home-assistant.io/t/zha-philips-hue-dimmer-switch-rwl020-rwl021/255048
mode: restart
max_exceeded: silent
variables:
force_brightness: !input force_brightness
trigger:
- platform: event
event_type: zha_event
event_data:
device_id: !input remote
action:
- variables:
command: "{{ trigger.event.data.command }}"
cluster_id: "{{ trigger.event.data.cluster_id }}"
endpoint_id: "{{ trigger.event.data.endpoint_id }}"
- choose:
# Light on
- conditions:
- "{{ command == 'on' }}"
- "{{ cluster_id == 6 }}"
- "{{ endpoint_id == 1 }}"
sequence:
- choose:
- conditions: "{{ force_brightness }}"
sequence:
- service: light.turn_on
target: !input light
data:
transition: 1
brightness_pct: !input brightness
default:
- service: light.turn_on
target: !input light
data:
transition: 1
# Light off
- conditions:
- "{{ command == 'off_press' }}"
- "{{ cluster_id == 64512 }}"
- "{{ endpoint_id == 2 }}"
sequence:
- service: light.turn_off
target: !input light
data:
transition: 1
# Brightness up
- conditions:
- "{{ command == 'step' }}"
- "{{ cluster_id == 8 }}"
- "{{ endpoint_id == 1 }}"
- "{{ trigger.event.data.params.step_mode == 0 }}"
sequence:
- service: light.turn_on
target: !input light
data:
brightness_step_pct: 10
transition: 1
# Brightness down
- conditions:
- "{{ command == 'step' }}"
- "{{ cluster_id == 8 }}"
- "{{ endpoint_id == 1 }}"
- "{{ trigger.event.data.params.step_mode == 1 }}"
sequence:
- service: light.turn_on
target: !input light
data:
brightness_step_pct: -10
transition: 1
I did try setting trigger.event.data.params.step_mode as a step_mode variable in the actions but I couldn’t get it to work 
.