It seems like the cursor gets stuck in the text field which will remain there even if I click or drag outside of the node, which prevents me from using the spacebar to search for new nodes. Selecting a different node first and then deselecting it will make the spacebar function properly.
VRC: VRCSDK3-2019.12.21.16.01
UDON: UDONSDK-2019.12.22.12.32_Public