Out-of-box synthesis for IP reuse

[SathvikSat]

Hello,
Say I want to modify only user logic box and resue other other open-nic-ips ( vivado_ip ). and synthesis open-nic-shell again.

That is, In 01 iteration of build I synthesized everything. Now, in subsequent build if I only modify user logic box, I can avoid synthesis of already synthesized IPs ( vivado_ip created in build-directory ) from iteration 01, isn't it?

So to achieve this, does synth_ip flag needs to be set to 0, to reuse vivado_ip and overwrite flag needs to be set to 1 as only user logic box has been modified?
But if this is the case, in script/buid.tcl line no 279 when overwrite flag is set to 1 even the vivado_ip in the build directory is deleted, meaning I cannot reuse previously snthesised vivado_ip in build-directory to reduce compile time, when only user-logic boxes are modified?